|Title||Astronomy Picture of the Day|
|Description||A different astronomy and space science related image is featured each day, along with a brief explanation.|
|Keywords||spacecraft, asteroid, collision, gravity, tractor near earth asteroid|
|Address||http://apod.nasa.gov/apod/ Add this site to your favorite list|
Astronomy Picture of the Day. Astronomy Picture of the Day. Discover the cosmos!
Each day a different image or photograph of our fascinating universe is.
featured, along with a brief explanation written by a professional astronomer. 2013 February 21.
Gravitational Tractor. Illustration Credit & Copyright: Dan Durda ( FIAAA , B612 Foundation )
Explanation: How would you change the course of an. Earth-threatening.asteroid? One possibility - a massive spacecraft that uses gravity as a towline -
is illustrated in this artist's vision of a gravitational.tractor in action. In the hypothetical.
scenario worked out.in 2005 by Edward Lu and Stanley Love at NASA's. Johnson.Space Center , a 20 ton.
nuclear-electric.spacecraft tows a 200 meter diameter asteroid by simply hovering.near the asteroid.
The spacecraft's. ion drive.thrusters are canted away from the surface. Their slight but steady thrust would gradually and.
predictably alter the course of the tug and asteroid, coupled by their.mutual ...
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